Title :
A novel wireless passive SAW sensor based on the delay line theory
Author :
Li, Tian L. ; Zheng, Liang ; Hu, Hong
Author_Institution :
Dept. of Mech. Eng., Harbin Inst. of Technol., Harbin
Abstract :
A novel wireless passive SAW temperature and pressure sensor is designed, based on the SAW delay line theory. The effect of the temperature is included in the pressure feedback signal and a weighted factor is introduced in order to separate the temperature effect from the feedback signal. Therefore, the temperature and pressure can be accurately measured at the same time. In this sensor design, the energy converted from IDT is fully used, and the interference between the signals is minimized. The IDT and its reflectors have been optimally designed to improve the sensitivity of the sensor. This wireless passive sensor is capable of working under complicated and hard conditions.
Keywords :
delay lines; feedback; interdigital transducers; interference (signal); pressure sensors; surface acoustic wave sensors; temperature sensors; wireless sensor networks; delay line theory; interdigital transducer; pressure feedback signal; pressure sensor; signal interference; surface acoustic wave; temperature sensor; wireless passive SAW sensor; Acoustic sensors; Delay lines; Mechanical sensors; Pressure measurement; Receiving antennas; Sensor phenomena and characterization; Surface acoustic waves; Temperature sensors; Tires; Wireless sensor networks; IDT; SAW; passive sensor; weighted factor;
Conference_Titel :
Nano/Micro Engineered and Molecular Systems, 2008. NEMS 2008. 3rd IEEE International Conference on
Conference_Location :
Sanya
Print_ISBN :
978-1-4244-1907-4
Electronic_ISBN :
978-1-4244-1908-1
DOI :
10.1109/NEMS.2008.4484373
